package com.lagou.boot;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;

/**
 * @author godai
 * @date 2021/1/31 13:45
 * @description
 */
@Component
public class AppContext implements ApplicationContextAware {

    private static ApplicationContext context;

    @Override
    public void setApplicationContext(ApplicationContext applicationContext)
            throws BeansException {

        if (context == null) {
            context = applicationContext;
        }
    }

    // 获取applicationContext
    public static ApplicationContext getApplicationContext() {
        return context;
    }

    // 通过name获取 Bean.
    public static Object getBean(String name) {
        return getApplicationContext().getBean(name);
    }

    // 通过class获取Bean.
    public static <T> T getBean(Class<T> clazz) {
        return getApplicationContext().getBean(clazz);
    }

    // 通过name,以及Clazz返回指定的Bean
    public static <T> T getBean(String name, Class<T> clazz) {

        return getApplicationContext().getBean(name, clazz);
    }

}
